package org.smart4j.framework.proxy;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Method;

/**
 * @author ：Anitaxiaofeng
 * @description：切面代理
 * @create 2017-12-16
 **/
public abstract class AspectProxy implements Proxy {
    private static final Logger LOGGER = LoggerFactory.getLogger(AspectProxy.class);

    //ProxyChain调用,并且执行完自身的before、after之后在调用proxyChain.doProxyChain继续下一个proxy
    //提供了一个模版这些类可以在AspectProxy的继承类中有选择性的进行实现
    @Override
    public final Object doProxy(ProxyChain proxyChain)throws Throwable{
        Object result = null;
        Class<?> cls = proxyChain.getTargetClass();
        Method method = proxyChain.getTargetMethod();
        Object[] params = proxyChain.getMethodParams();
        begin();
        try{
            if(intercept(cls,method,params)){
                before(cls,method,params);
                result = proxyChain.doProxyChain();
                after(cls,method,params);
            }else{
                result = proxyChain.doProxyChain();
            }
        }catch(Exception e){
            LOGGER.error("proxy failure",e);
            error(cls,method,params,e);
            throw e;
        } finally{
            end();
        }
        return result;
    }
    public void begin(){}
    public boolean intercept(Class<?> cls, Method method,Object[] params) throws Throwable{
        return true;
    }
    public void before(Class<?> cls, Method method,Object[] params)throws Throwable{}
    public void after(Class<?> cls,Method method,Object[] params) throws Throwable{}
    public void error(Class<?> cls,Method method,Object[] params, Throwable e){};
    public void end(){};

}
